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5(7x + 8) + 3(2x + b) ≡ ax + 13 Find the values of a and b

35x + 6x + 3b ≡ ax + 13 41x + 3b ≡ ax + 13 when x=0 3b + 40 = 13 3b= -27 b=-9 so 41x - 27 + 40 ≡ ax + 13 when x = 1 41-27 + 40 = a + 13a = 41
TM
Answered by Taylor M. • Maths tutor
6632 Views

Solve the simultaneous equations. 5x+y=21, x-3y=9.

We commonly solve this via the method of substitution. We label each equation i and ii. We then solve the first equation i for a single variable. We then substitute this value into the secod equation, and so...
SW
Answered by Sam W. • Maths tutor
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Line A passes through point Q(2,3). Line B is parallel to line A and has the equation 2y-3x=4. What is the equation of line A?

If two lines are parallel they have the same gradient so we must find the gradient of line B and use it to find line ALine B ==> 2y - 3x + 4 = 0This can be rearranged in to the form "y = mx + c"...
SV
Answered by sameer v. • Maths tutor
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Calculate the concentration of Sodium Chloride, NaCl, if you have 0.0010 moles in 55cm^3

Most important Chem equation to know: moles = concentration x volumerearrange the equation as you want to find out the concentration: concentration = moles/volume substitute in the given values: concentratio...
PR
2258 Views

What approach should I take when first seeing an unfamiliar poem?

The first thing to look at is the title. This is often discounted by students, but especially since the poem might be a relatively short text, it is important to utilise any helpful content. Think about what...
RS
3784 Views