Solve the simultaneous equations 3x + 2y = -7 and x=4y+21
Substitute in the second equation into the first to eliminate x from the first equation. Solve for y which should, when solved (shown below), equal -5. Sub -5 back into either equation in the place of y to then solve for x (shown below) x should then equal 1.
3(4y+21) +2y = -7 (solve for y)y = -53x +2(-5) = -7 (solve for x)x = 1
JG
Related Maths GCSE answers
All answers ▸Solve the quadratic equation (x^2)-7x+10=0
The point P has coordinates (3, 4) The point Q has coordinates (a, b) A line perpendicular to PQ is given by the equation 3x + 2y = 7 Find an expression for b in terms of a
How to solve simultaneous equations with two unknowns?
Expand and Simplify (2x+3)(3x-3)