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Solve the following simultaneous equations: 3y=7+5x (1) 9x=-7y-4 (2)

Rearrange (2): x=(-7y-4)/9Substitute the value of x from (2) into (1): 3y=7+5*(-7y-4)/9 Simplify and rearrange for y: y+(35y/27)=(7/3) -(20/27)Resolve for y: y=43/62Substitute y into (1): (3*63)/62=7+5xRearr...
TD
Answered by Tutor510286 D. • Maths tutor
3217 Views

Solve x(x-1)-12=0

Expand the brackets to find x 2 -x-12=0Factorise the equation to find (x-4)(x+3)=0Check it expands to equal x 2 -x-12=0Find the value of x as:x+4=0 therefore X=4x-3=0 therefore X=-3
SW
Answered by Sarah W. • Maths tutor
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Can you explain reflexive verbs and teach me how to conjugate them?

Of course!Reflexive verbs in Spanish are used when a person or thing is performing an action on itself.here is an example for each of the verb endings:lavarse - to wash oneselfverse - to see oneselfvestirse ...
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Answered by Caylan G. • Spanish tutor
2314 Views

Find the gradient of the line x^2 + 3x - 6 at the point (5,34)

Differentiate: 2x + 3.Substitute for x=5: 2(5) + 3Answer =13.
DD
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Factorise fully X^2 - 6X + 8

Factorising means reducing an equation to a set of brackets, in the form (x+a)(x+b), where a and b are constants. To factorise this equation, we must find two numbers that add to make -6, and multiply to mak...
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Answered by Dan D. • Maths tutor
3995 Views