Solve the simultaneous equation: 3x+y=-2, -7x+5y=34.
3x+y=-2 ...1)
-7x+5y=34 ...2)
Using the substitution method:
Rearrange equation 1):
y=-3x-2 ...1))
substitute equation 1)) into eqaution 2)
-7x +5(-3x-2)=34
-7x-15x-10=34
-22x=44
x=-2
subsitute x into 1))
y=-3(-2) -2
y=4
Therefore, x=-2, y=4
SJ
Related Maths GCSE answers
All answers ▸PQRS is a parallelogram with P->Q=a and P->S=b. Find S->Q in terms of a and b. N is a point between S and Q, where SN:NQ is 3:2, find N->R
Solve the equation (2x-4)/2 + (6x+1)/3 = (16x+10)/12.
Alice will play 2 games of tennis against Bob. Alice’s chances of winning each game is 0.7. Work out the probability of Alice winning exactly one match.
Solve x^2 = 4(x - 3)^2