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 ▸One of the teachers at a school is chosen at random. The probability that this teacher is female is 3/5. There are 36 male teachers at the school. Work out the total number of teachers at the school.
5x+3 = 18. What is the value of x?
what is half of five-eights as a percentage?
Solve the simultaneous equations 2x + y = 8 and 3x + 2y = 14